I run the computer off the right side and an spg off the left for redundancy. Before I get it, I know you would just abort the dive. I like the runduntant info without the extra gear to lug.
Vie:UWATEC Smart TEC and Oceanic Atom. These two are capable of switching between up to three transmitters. IMHO, Atom has rather small screen and the reliability is just not there yet.
http://www.scubapro.com/products/comps/sm_tec_wrist/sm_tec_wrist.asp
http://www.oceanicworldwide.com/p_computers_atom.html
perhaps I should add that most tech divers (most that I know anyway) would probably consider an air integrated computer to be unsuitable for technical diving.